I think they, the devs didn\'t want payment, because they wanted PS to stay free. As in truly free, not having a free play mode, and a pay play mode, or anything like that.
Now I know everyone will jump and say that people don\'t *have* to pay, it\'s an option, but once PS generates any profit, some of the devs may want it to keep the profit coming, or the publishers, or whoever else gets involved may want to keep the profit coming. Because of that I think that PS does not want any money. Anyway, off with my opinion, it\'s slightly inibreated...